Document X77v48nRamynzbkqoL8b4Ger4

*M *10* **V lTITSULfUGll COH. IiNC CO 111*0RATION July 2, 1969 C b&AJ xx ocr/> Regional Director^ U. S. Deportment of Labor Burea^ of/Labor Standards .601 Mayflower Building Dallas,/Texas 75201 Dear Mr. Blair: / Dr. Morton Corn, Professor of Industrial Hygiene, Graduate School of Public Health, University of Pittsburgh, pcrforaied on industrial hygiene survey of ou* Tyler, Texas plant recently. A copy of his report which you requested -in your June 16 letter is attached. All persons working in areas where the report shows dust levels in excess of the threshold limit values have been required to wear a dust respirator approved by the U. S. Bureau of Mines for Pneumoconiosis producing, and for nuisance dusts. They will continue to wear such respirators until the dust exposure ha6 been reduced to safe levels.' The Central Engineering Deportment of our company, with the assistance of Dr. Corn, has initiated a design program for complete dust control and collection in this plant. The total program including installation is scheduled for completion by mid-February, 1970. If you need additional Information, please advise. Tours very truly, PITTSBURGH CCRMItIG CORPORATION BMS/rb Attch. cc: Dr. L. B. Grant, M.D Hr. H. C." Uhderwoo3 attch.) Hr. J. H. Bierer Hr. E. W. Holman Hr. C . van Horne tX 'M. Stout President of Manufacturing r <ry'. J y' ( -Jri-tf I PLAINTIFF'S f EXHIBIT j/